call_user_func_array() error

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I’m using wordpress 4.0, and I get the following php warnings in my log:

PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘et_add_viewport_meta’ not found or invalid function name in /var/www/vhosts/mydomain.com/httpdocs/blog/wp-includes/plugin.php on line 505

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I checked the plugin.php line 505, and found this line:

call_user_func_array($the_[‘function’], array_slice($args, 0, (int) $the_[‘accepted_args’]));

How can I fix this, what can be the problem?

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1 comment

  1. Check your wordpress functions.php under ~/wp-content/themes/YOURTHEMENAME/ directory.

    There should be this function defined:

    function et_add_viewport_meta(){
     echo '<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" />';
}